linux-kernel - Re: [PATCH v3 1/6] staging:iio:ad2s90: Make read_raw return spi

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Date:   Sun, 4 Nov 2018 16:36:16 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Matheus Tavares <matheus.bernardino@....br>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-usp@...glegroups.com
Subject: Re: [PATCH v3 1/6] staging:iio:ad2s90: Make read_raw return
 spi_read's error code

On Sat,  3 Nov 2018 19:49:43 -0300
Matheus Tavares <matheus.bernardino@....br> wrote:

> Previously, when spi_read returned an error code inside ad2s90_read_raw,
> the code was ignored and IIO_VAL_INT was returned. This patch makes the
> function return the error code returned by spi_read when it fails.
> 
> Signed-off-by: Matheus Tavares <matheus.bernardino@....br>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/resolver/ad2s90.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
> index 59586947a936..ba55de29ef36 100644
> --- a/drivers/staging/iio/resolver/ad2s90.c
> +++ b/drivers/staging/iio/resolver/ad2s90.c
> @@ -36,11 +36,12 @@ static int ad2s90_read_raw(struct iio_dev *indio_dev,
>  
>  	mutex_lock(&st->lock);
>  	ret = spi_read(st->sdev, st->rx, 2);
> -	if (ret)
> -		goto error_ret;
> +	if (ret < 0) {
> +		mutex_unlock(&st->lock);
> +		return ret;
> +	}
>  	*val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
>  
> -error_ret:
>  	mutex_unlock(&st->lock);
>  
>  	return IIO_VAL_INT;